Internal DNS SRV cache overflow condition. In the past %1 minutes, the internal DNS SRV record cache has reached capacity ...

Lync Server 2013

Internal DNS SRV cache overflow condition.

In the past %1 minutes, the internal DNS SRV record cache has reached capacity %2 times. The cache can retain a maximum of %3 results.
Cause: The SIP protocol stack in the Access Edge Server retains an in-memory cache of DNS query results in order to reduce the amount of network traffic generated by DNS SRV queries against tenant and federated partner domains. The cache might overflow if the Access Edge Server interacts with many federated partners, or in a service deployment that hosts many tenant domains. Frequent overflow can lead to serious deterioration of the local network.
Resolution:
Consider increasing the size of the DNS cache using the "DnsCacheRecordCount" setting in the configuration.

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